Improving the L1 Trigger Precision and Efficiency

Undergraduate Honors Thesis

Citations

Citeable URL: https://scholar.colorado.edu/concern/undergraduate_honors_theses/gq67js133

Abstract

The Compact Muon Solenoid(CMS) at the Large Hadron Collider(LHC) in Geneva Switzerland, is a particle detector which seeks to discover particles which go beyond the standard model of particle physics. The LHC is the world's largest particle accelerator, and is capable of collisions of much higher energy then any other accelerator. The LHC will be undergoing high luminosity upgrades which will be complete in the year 2027, and the High Luminosity LHC will run for 10 years after this. In order to keep up with the higher luminosity a level one trigger and tracker system will be implemented. The trigger and tracker have an upper limit on the rate at which they can transmit data, and the hardware used in the level one trigger has memory storage limits as well. In order to maximize the efficiency of this system I studied the number of bits used to store $P_{t}$,$\phi$, and $z_{0}$ in the detector. I found that 8 bits, lower then the current suggested usage for each variable, is more then sufficient as far as the transverse missing energy of the particles is concerned. I also studied a way to isolate W boson decays from B meson decays so that W boson decay events can be efficiently identified for further study. I made a cone around the muons resulting from both events and applied a series of quality selection criteria in order to maximize the efficiency with which W boson decay events can be identified in comparison to B meson decay events.

Creator